This Chrome extension, Daily Collab, uses React to embed an entire video call into any webpage, including Notion pages. The extension communicates with a custom API and the browser's background script to manage state and updates. It associates a Notion page with a Daily room, which is used to identify the current live call. When a user starts or joins a call on the same page, the extension updates the UI in real-time using React context and polling every second for new information. The extension also handles multiple tabs staying in sync for any live calls.